North America’s Most Endangered Animals- page 100 | Science | Smithsonian
Kemp's ridleys are the world's smallest sea turtles and are also the most endangered. (Erich Schlegel / International_NI / Corbis)

North America’s Most Endangered Animals

Snails, marmots, condors and coral reef are among the many species on the continent that are close to extinction

Franklin’s Bumblebee (Bombus franklini)

Franklins bumblebee
(Robbin Thorp / Associated Press)
Franklin’s bumblebee lives in a narrow, 190-mile stretch of southern Oregon and northern California, between the Sierra-Cascade and the Coast Mountains. The population began to decline in the late 1990s, and no one has spotted the bumblebee, named after early 20th-century entomologist Henry J. Franklin, since 2006.

The decline of the Franklin’s bumblebee may be due to the spread of a disease introduced by bumblebees imported from Europe to pollinate commercial crops of tomatoes, peppers and other plants, says Robbin Thorp, an entomologist at the University of California, Davis. Populations of three other closely related bumblebee species are also dwindling, probably for the same reason. Bumblebees are not the only endangered bees in North America. In the past five years, beekeepers have lost up to 90 percent of their honeybee colonies to colony collapse disorder, a mysterious phenomenon whose cause is not yet known; pesticides, pathogens and stress are possible culprits.

But Franklin’s bumblebee could make a comeback. If at least some immune individuals survived the disease, they could repopulate the area, Thorp says. This summer he plans to search for survivors in the bumblebee’s territory. -- EW

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